07/03/2014 12:38 EDT | Updated 09/02/2014 05:59 EDT

Nathan O'Brien Amber Alert: Family of missing boy and grandparents starts blog

People looking to offer messages of support to the family of a missing Calgary boy and his grandparents can do so on a new blog.

Police said messages of support have been rolling in from across the country. The blog has been created as a dedicated place for those messages, along with information on how people can submit tips to Crime Stoppers. 

Since the family of Nathan O'Brien, 5, and his grandparents made a plea for their safe return, Calgary police said they have received numerous tips and that those are currently under investigation.


'Stay strong,' urge family of missing Nathan O'Brien, 5, and his grandparents

​Nathan and his grandparents – Kathy, 56, and Alvin Liknes, 66 – were discovered missing at 10 a.m. MT Monday after Nathan's mother went to pick him up from a sleepover at their house.

They had held an estate sale over the weekend to get rid of some things before moving to their new home in Edmonton and the O'Brien family was over helping out.

On Sunday, Nathan's mother left him with his grandparents after a day of helping out at the sale and then called police Monday morning when she found no one in the house.

An Amber Alert was issued at 5:15 p.m. MT and police said there are signs the three did not leave the house willingly.

Calgary police are asking anyone who attended the estate sale to come forward.

Investigators will be at the Parkhill Community Centre at 4013 Stanley Rd. S.W. on Thursday from 10 a.m. to 10 p.m. MT to speak with anyone who attended the sale.

Police ask that anyone who bought something from the sale bring a photo of it to the community centre so they can catalogue what was purchased and what remains in the home.

No idea of motive

Four days after the three went missing, there are still many unanswered questions and investigators say the longer it goes on, the more concerned they become.

"We don't know the motive behind this. Right now we have three individuals who have disappeared under suspicious circumstances," said Doug Andrus of the Calgary Police Service. 

"I can tell you, though, that the forensic crime scenes unit did examine some marks on the side of the house and we're in the process of determining their relevance to the investigation," he said."

"There were marks on the side of the house that went on for a distance."

At this point, the Amber Alert remains active.

Anyone with information is asked to contact the Calgary Police Service at 403-266-1234 or Crime Stoppers at 1-800-222-8477.